Condensed cyclic compound and organic light-emitting device including the same

ABSTRACT

A condensed cyclic compound represented by Formula 1 
     
       
         
         
             
             
         
       
     
     wherein in Formula 1, groups X 1  to X 8 , L 11 , L 12 , R 11 , R 12  and variables a11, a12, b11, b12 are described in the specification.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims a priority to Korean Patent Application No.10-2013-0146414, filed on 28 Nov. 2013, and all the benefits accruingtherefrom under 35 U.S.C. §119, the content of which is incorporatedherein in its entirety by reference.

BACKGROUND

1. Field

One or more embodiments relate to a condensed cyclic compound and anorganic light-emitting device including the same.

2. Description of the Related Art

Organic light emitting devices (OLEDs) are self-emission devices thathave wide viewing angles, high contrast ratios, short response time,excellent brightness, driving voltage, and response speedcharacteristics, and produce full-color images.

As an example, an organic light-emitting device includes an anode, acathode, and an organic layer that is disposed between the anode and thecathode and further includes an emission layer. A hole transport regionmay be disposed between the anode and the emission layer, and anelectron transport region may be disposed between the emission layer andthe cathode. Holes provided from the anode may move toward the emissionlayer through the hole transport region, and electrons provided from thecathode may move toward the emission layer through the electrontransport region. Carriers, such as holes and electrons, are recombinedin the emission layer to produce excitons. These excitons change from anexcited state to a ground state, thereby generating light.

Different types of OLEDs have been reported. However, there remains aneed in OLEDs having one or more of low driving voltage, highefficiency, high brightness, and long lifespan.

SUMMARY

One or more embodiments relate to a novel condensed cyclic compound andan organic light-emitting device including the same.

An aspect provides a condensed cyclic compound represented by Formula 1:

wherein in Formula 1,

X₁ is N or C-[(L₁)_(a1)-(R₁)_(b1)],

X₂ is N or C-[(L₂)_(a2)-(R₂)_(b2)],

X₃ is N or C-[(L₃)_(a3)-(R₃)_(b3)],

X₄ is N or C-[(L₄)_(a4)-(R₄)_(b4)],

X₅ is N or C-[(L₅)_(a5)-(R₅)_(b5)],

X₆ is N or C-[(L₆)_(a6)-(R₆)_(b6)],

X₇ is N or C-[(L₇)_(a7)-(R₇)_(b7)],

X₈ is N or C-[(L₈)_(a8)-(R₈)_(b8)],

provided that at least one of X₁ to X₈ is N;

L₁ to L₈, L₁₁, and L₁₂ are each independently selected from asubstituted or unsubstituted C₃-C₁₀ cycloalkylene group, a substitutedor unsubstituted C₂-C₁₀ heterocycloalkylene group, a substituted orunsubstituted C₃-C₁₀ cycloalkenylene group, a substituted orunsubstituted C₂-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₂-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic hetero-condensed polycyclic group;

a1 to a8, a11, and a12 are each independently an integer from 0 to 3;

R₁ to R₈, R₁₁, and R₁₂ are each independently selected from a hydrogen,a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a substitutedor unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstitutedC₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynylgroup, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substitutedor unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₂-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₂-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arythio group, a substituted orunsubstituted C₂-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇);

b1 to b8, b11, and b12 are each independently an integer from 1 to 5;

wherein at least one of substituents of the substituted C₃-C₁₀cycloalkylene group, the substituted C₂-C₁₀ heterocycloalkylene group,the substituted C₃-C₁₀ cycloalkenylene group, the substituted C₂-C₁₀heterocycloalkenylene group, the substituted C₆-C₆₀ arylene group, thesubstituted C₂-C₆₀ heteroarylene group, the substituted divalentnon-aromatic condensed polycyclic group, the substituted divalentnon-aromatic condensed heteropolycyclic group, the substituted C₁-C₆₀alkyl group, the substituted C₂-C₆₀ alkenyl group, the substitutedC₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxy group, thesubstituted C₃-C₁₀ cycloalkyl group, the substituted C₂-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₂-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀arythio group, the substituted C₂-C₆₀ heteroaryl group, the substitutedmonovalent non-aromatic condensed polycyclic group, and the substitutedmonovalent non-aromatic condensed heteropolycyclic group is selectedfrom

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkylgroup, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, aC₃-C₁₀ cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and —B(Q₁₆)(Q₁₇);

a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group; and

a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one group selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),—Si(Q₂₃)(Q₂₄)(Q₂₅), and —B(Q₂₆)(Q₂₇); and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇), wherein

Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ are each independentlyselected from a hydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group,a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkylgroup, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arythio group, a C₂-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group.

Another aspect provides an organic light-emitting device including:

a first electrode;

a second electrode; and

an organic layer disposed between the first electrode and the secondelectrode,

wherein the organic layer includes an emission layer and at least one ofthe condensed cyclic compound represented by Formula 1.

The condensed cyclic compound may be included in the emission layer, andthe emission layer may further include a dopant, and the condensedcyclic compound included in the emission layer may act as a host.Herein, the emission layer may be a green emission layer emitting greenlight, and the dopant may be a phosphorescent dopant that emits lightaccording to a phosphorescent mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an organic light-emitting device accordingto an embodiment;

FIG. 2 is a graph of weight (percent, %) and derivative weight (percentper degree Centigrade, %/° C.) versus temperature (degrees Centigrade, °C.) showing thermo gravimetric analysis (TGA) data of Compound 1;

FIG. 3 is a graph of heat flow (watts per gram, W/g) versus temperature(degrees Centigrade, ° C.) showing differential scanning calorimetry(DSC) data of Compound 1;

FIG. 4 is a graph of weight (percent, %) and derivative weight (percentper degree Centigrade, %/° C.) versus temperature (degrees Centigrade, °C.) showing TGA data of Compound 129; and

FIG. 5 is a graph of heat flow (watts per gram, W/g) versus temperature(degrees Centigrade, ° C.) showing DSC data of Compound 129.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, examples of whichare illustrated in the accompanying drawings, wherein like referencenumerals refer to like elements throughout. In this regard, the presentembodiments may have different forms and should not be construed asbeing limited to the descriptions set forth herein. Accordingly, theembodiments are merely described below, by referring to the figures, toexplain aspects of the present description. Expressions such as “atleast one of,” when preceding a list of elements, modify the entire listof elements and do not modify the individual elements of the list.

It will be understood that when an element is referred to as being “on”another element, it can be directly in contact with the other element orintervening elements may be present therebetween. In contrast, when anelement is referred to as being “directly on” another element, there areno intervening elements present.

It will be understood that, although the terms first, second, third etc.may be used herein to describe various elements, components, regions,layers, and/or sections, these elements, components, regions, layers,and/or sections should not be limited by these terms. These terms areonly used to distinguish one element, component, region, layer, orsection from another element, component, region, layer, or section.Thus, a first element, component, region, layer, or section discussedbelow could be termed a second element, component, region, layer, orsection without departing from the teachings of the present embodiments.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting. As used herein, thesingular forms “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise.

The term “or” means “and/or.” It will be further understood that theterms “comprises” and/or “comprising,” or “includes” and/or “including”when used in this specification, specify the presence of statedfeatures, regions, integers, steps, operations, elements, and/orcomponents, but do not preclude the presence or addition of one or moreother features, regions, integers, steps, operations, elements,components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this general inventive conceptbelongs. It will be further understood that terms, such as those definedin commonly used dictionaries, should be interpreted as having a meaningthat is consistent with their meaning in the context of the relevant artand the present disclosure, and will not be interpreted in an idealizedor overly formal sense unless expressly so defined herein.

Exemplary embodiments are described herein with reference to crosssection illustrations that are schematic illustrations of idealizedembodiments. As such, variations from the shapes of the illustrations asa result, for example, of manufacturing techniques and/or tolerances,are to be expected. Thus, embodiments described herein should not beconstrued as limited to the particular shapes of regions as illustratedherein but are to include deviations in shapes that result, for example,from manufacturing. For example, a region illustrated or described asflat may, typically, have rough and/or nonlinear features. Moreover,sharp angles that are illustrated may be rounded. Thus, the regionsillustrated in the figures are schematic in nature and their shapes arenot intended to illustrate the precise shape of a region and are notintended to limit the scope of the present claims.

A condensed cyclic compound according to an embodiment is represented byFormula 1 below:

X₁ in Formula 1 is N or C-[(L₁)_(a1)-(R₁)_(b1)],

X₂ is N or C-[(L₂)_(a2)-(R₂)_(b2)],

X₃ is N or C-[(L₃)_(a3)-(R₃)_(b3)],

X₄ is N or C-[(L₄)_(a4)-(R₄)_(b4)],

X₅ is N or C-[(L₅)_(a5)-(R₅)_(b5)],

X₆ is N or C-[(L₆)_(a6)-(R₆)_(b6)],

X₇ is N or C-[(L₇)_(a7)-(R₇)_(b7)],

X₈ is N or C-[(L₈)_(a8)-(R₈)_(b8)], and

at least one of X₁ to X₈ is N.

According to an embodiment, at least one of X₅ to X₈ in Formula 1 may beN. For example, X₆ and X₈ in Formula 1 may be N, but are not limitedthereto.

For example, in Formula 1,

X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)],

X₂ may be C-[(L₂)_(a2)-(R₂)_(b2)],

X₃ may be C-[(L₃)_(a3)-(R₃)_(b3)],

X₄ may be C-[(L₄)_(a4)-(R₄)_(b4)],

X₅ may be C-[(L₅)_(a5)-(R₅)_(b5)],

X₆ may be N, X₇ may be C-[(L₇)_(a)-(R₇)_(b7)], and

X₈ may be N, but they are not limited thereto.

L₁ to L₈, L₁₁, and L₁₂ in Formula 1 may be each independently selectedfrom a substituted or unsubstituted C₃-C₁₀ cycloalkylene group, asubstituted or unsubstituted C₂-C₁₀ heterocycloalkylene group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a substitutedor unsubstituted C₂-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₂-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic hetero-condensed polycyclic group.

According to an embodiment, L₁ to L₈, L₁₁, and L₁₂ in Formula 1 are eachindependently selected from

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthrenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pyrrolylene group, animidazolylene group, a pyrazolylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, anisoindolylene group, an indolylene group, an indazolylene group, apurinylene group, a quinolinylene group, an isoquinolinylene group, abenzoquinolinylene group, a phthalazinylene group, a naphthyridinylenegroup, a quinoxalinylene group, a quinazolinylene group, a cinnolinylenegroup, a carbazolylene group, a phenanthridinylene group, anacridinylene group, a phenanthrolinylene group, a phenazinylene group, abenzooxazolylene group, a benzoimidazolylene group, a furanylene group,a benzofuranylene group, a thiophenylene group, a benzothiophenylenegroup, a thiazolylene group, an isothiazolylene group, abenzothiazolylene group, an isoxazolylene group, an oxazolylene group, atriazolylene group, a tetrazolylene group, a oxadiazolylene group, atriazinylene group, a dibenzofuranylene group, a dibenzothiophenylenegroup, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyrimidinylene group, and an imidazopyridinylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthrenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pyrrolylene group, animidazolylene group, a pyrazolylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, anisoindolylene group, an indolylene group, an indazolylene group, apurinylene group, a quinolinylene group, an isoquinolinylene group, abenzoquinolinylene group, a phthalazinylene group, a naphthyridinylenegroup, a quinoxalinylene group, a quinazolinylene group, a cinnolinylenegroup, a carbazolylene group, a phenanthridinylene group, anacridinylene group, a phenanthrolinylene group, a phenazinylene group, abenzooxazolylene group, a benzoimidazolylene group, a furanylene group,a benzofuranylene group, a thiophenylene group, a benzothiophenylenegroup, a thiazolylene group, an isothiazolylene group, abenzothiazolylene group, an isoxazolylene group, an oxazolylene group, atriazolylene group, a tetrazolylene group, a oxadiazolylene group, atriazinylene group, a dibenzofuranylene group, a dibenzothiophenylenegroup, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyrimidinylene group, and an imidazopyridinylene group, eachsubstituted with at least one group selected from

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a C₆-C₂₀ aryl group, a C₂-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heterocyclic group, and —Si(Q₃₃)(Q₃₄)(Q₃₅),wherein

Q₃₃ to Q₃₅ may be each independently selected from a hydrogen, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, ananthracenyl group, a pyrenyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, apyridazinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a phthalazinyl group, a quinoxalinyl group, acynolinyl group, and a quinazolinyl group.

According to another embodiment, in Formula 1, L₁ to L₈, L₁₁, and L₁₂are each independently selected from Formulae 2-1 to 2-33:

wherein in Formulae 2-1 to 2-33,

Y₁ is O, S, S(═O), S(═O)₂, C(Z₃)(Z₄), N(Z₅), or Si(Z₆)(Z₇);

Z₁ to Z₇ may be each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, ananthracenyl group, a triphenylenyl group, a pyrenyl group, aphenanthrenyl group, a fluorenyl group, a chrysenyl group, a carbazolylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a pyridinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinazolinyl group, a quinoxalinyl group, abiphenyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅);

Q₃₃ to Q₃₅ may be each independently selected from a hydrogen, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, ananthracenyl group, a pyrenyl group, a phenanthrenyl group, a fluorenylgroup, a chrysenyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a pyridinyl group, a pyrimidinyl group, a triazinyl group, aquinolinyl group, an isoquinolinyl group, a quinazolinyl group, and aquinoxalinyl group; and

d1 may be an integer of 1 to 4,

d2 may be an integer of 1 to 3,

d3 may be an integer of 1 to 6,

d4 may be an integer of 1 to 8;

d5 may be an integer of 1 or 2,

d6 may be an integer of 1 to 5, and

* and *′ may each indicate a binding site to a neighboring atom.

For example,

* in Formulae 2-1 to 2-33 indicates a binding site to the core ofFormula 1 or each of neighboring L₁ to L₈, L₁₁, and L₁₂, and

*′ in Formulae 2-1 to 2-33 indicates a binding site to each ofneighboring L₁ to L₈, L₁₁, and L₁₂ or each of R₁ to R₈, R₁₁, and R₁₂.

According to another embodiment, L₁ to L₈, L₁₁, and L₁₂ in Formula 1 areeach independently selected from Formulae 3-1 to 3-38:

wherein in Formulae 3-1 to 3-38,

* and *′ each indicates a binding site to a neighboring atom.

a1 in Formula 1 indicates the number of L₁, and may be 0, 1, 2, or 3,for example, 0, 1 or 2. When a1 is 0, L₁ indicates a single bond. Whena1 is 2 or more, groups L₁ may be identical or different. L₂ to L₈, L₁₁,and L₁₂ may be understood by referring to the description provided inconnection with L₁ and the structure of Formula 1.

R₁ to R₈, R₁₁, and R₁₂ in Formula 1 may be each independently selectedfrom a hydrogen, a deuterium, —F (fluoro group), —Cl (chloro group), —Br(bromo group), —I (iodo group), a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a substitutedor unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstitutedC₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynylgroup, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substitutedor unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₂-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₂-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arythio group, a substituted orunsubstituted C₂-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇).

According to an embodiment, R₁ to R₈ in Formula 1 are not a hydrogen atthe same time.

According to an embodiment, L₁ to L₈, L₁₁, and L₁₂ in Formula 1 may beeach independently selected from a hydrogen, a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxygroup;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, and a phosphoric acid group ora salt thereof;

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isooxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group;

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isooxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a pentalenyl group, an indenylgroup, a naphthyl group, an azulenyl group, a heptalenyl group, anindacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a pycenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazole group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthylidinylgroup, a quinoxalinyl group, a quinazolinyl group, a cynolinyl group, acarbazolyl group, a phenanthridinyl, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, and a biphenyl group; and

—Si(Q₃)(Q₄)(Q₅);

wherein Q₃ to Q₅ and Q₃₃ to Q₃₅ may be each independently selected froma hydrogen, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group,a naphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenylgroup, a fluorenyl group, a chrysenyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a pyridinyl group, a pyrimidinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinazolinyl group, and a quinoxalinyl group.

For example, R₁ to R₈, R₁₁, and R₁₂ in Formula 1 may be eachindependently selected from

a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof and a phosphoric acid group or asalt thereof;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pycenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group.

Q₃₃ to Q₃₅ may be each independently selected from a hydrogen, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, ananthracenyl group, a pyrenyl group, a phenanthrenyl group, a fluorenylgroup, a chrysenyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a pyridinyl group, a pyrimidinyl group, a triazinyl group, aquinolinyl group, an isoquinolinyl group, a quinazolinyl group, and aquinoxalinyl group.

As another example, R₁ to R₅ in Formula 1 may be each independentlyselected from

a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof and a phosphoric acid group or asalt thereof; and

Formulae 4-1 to 4-60 below;

R₁₁ and R₁₂ may be each independently selected from

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, and a phosphoric acid group ora salt thereof; and

Formulae 4-1 to 4-60 below, but they are not limited thereto:

wherein in Formulae 4-1 to 4-60,

Y₃₁ is O, S, C(Z₃₃)(Z₃₄), N(Z₃₅), or Si(Z₃₆)(Z₃₇);

Z₃₁ to Z₃₉ may be each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, —Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pycenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group;

Q₃₃ to Q₃₅ may be each independently selected from a hydrogen, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, ananthracenyl group, a pyrenyl group, a phenanthrenyl group, a fluorenylgroup, a chrysenyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a pyridinyl group, a pyrimidinyl group, a triazinyl group, aquinolinyl group, an isoquinolinyl group, a quinazolinyl group, and aquinoxalinyl group; and

e1 may be an integer of 1 to 5;

e2 may be an integer of 1 to 7;

e3 may be an integer of 1 to 3;

e4 may be an integer of 1 to 4;

e5 may be an integer of 1 or 2;

e6 may be an integer of 1 to 6, and

* indicates a binding site to a neighboring atom.

According to another embodiment, R₁ and R₅ in Formula 1 may be eachindependently selected from

a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, and a phosphoric acid group ora salt thereof; and

Formulae 5-1 to 5-91 below;

R₁₁ and R₁₂ may be each independently selected from

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, and a phosphoric acid group ora salt thereof; and

Formulae 5-1 to 5-91 below:

wherein in Formulae 5-1 to 5-91,

* indicates a binding site to a neighboring atom.

b1 in Formula 1 indicates the number of R₁, and may be an integer of 1to 5, for example, an integer of 1 to 3. b1 may be 1 or 2, or 1. When b1is 2 or more, groups R₁ may be identical or different. b2 to b8, b11,and b12 may be understood by referring to the description provided inconnection with b1.

For example, the condensed cyclic compound may be represented by Formula1A below:

L₅, L₇, a5, a7, R₁, R₂, R₃, R₄, R₅, R₇, R₁₁, R₁₂, b5, and b7 in Formula1A may be understood by referring to the description provided herein.

For example, in Formula 1A,

L₅ and L₇ may be each independently selected from

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pirenylene group, a chrisenylene group, apicenylene group, a pyridinylene group, a pyrazinylene group, apyrimidinylene group, a pyridazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a quinoxalinylenegroup, a quinazolinylene group, a carbazolylene group, aphenanthridinylene group, a phenanthrolinylene group, abenzoimidazolylene group, a benzofuranylene group, a benzothiophenylenegroup, an isobenzothiazolylene group, a benzooxazolylene group, anisobenzooxazolylene group, a triazolylene group, an oxadiazolylenegroup, a triazinylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, an imidazopyridinylene group, and animidazopyrimidinylene group;

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pirenylene group, a chrisenylene group, apicenylene group, a pyridinylene group, a pyrazinylene group, apyrimidinylene group, a pyridazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a quinoxalinylenegroup, a quinazolinylene group, a carbazolylene group, aphenanthridinylene group, a phenanthrolinylene group, abenzoimidazolylene group, a benzofuranylene group, a benzothiophenylenegroup, an isobenzothiazolylene group, a benzooxazolylene group, anisobenzooxazolylene group, a triazolylene group, an oxadiazolylenegroup, a triazinylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, an imidazopyridinylene group and animidazopyrimidinylene group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pycenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group;

a5 and a7 are each independently 0, 1, or 2;

R₁, R₂, R₃, and R₄ may be each independently selected from

a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, and a phosphoric acid group ora salt thereof;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group, a fluorenyl group,a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pycenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a phenanthridinyl group, aphenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzooxazolylgroup, an isobenzooxazolyl group, a triazolyl group, an oxadiazolylgroup, a triazinyl group, a dibenzofuranyl group, a dibenzothio group, aphenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyridinyl group, and an imidazopyrimidinyl group;

R₅ and R₇ may be each independently selected from

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group, a fluorenyl group,a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pycenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a phenanthridinyl group, aphenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzooxazolylgroup, an isobenzooxazolyl group, a triazolyl group, an oxadiazolylgroup, a triazinyl group, a dibenzofuranyl group, a dibenzothio group, aphenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyridinyl group, and an imidazopyrimidinyl group;

R₁₁ and R₁₂ may be each independently selected from

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, and a phosphoric acid group ora salt thereof;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group, a fluorenyl group,a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pycenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a phenanthridinyl group, aphenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzooxazolylgroup, an isobenzooxazolyl group, a triazolyl group, an oxadiazolylgroup, a triazinyl group, a dibenzofuranyl group, a dibenzothio group, aphenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyridinyl group, and an imidazopyrimidinyl group;

b5 and b7 are each independently 1 or 2,

wherein Q₃₃ to Q₃₅ may be each independently selected from a hydrogen, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthylgroup, an anthracenyl group, a pyrenyl group, a phenanthrenyl group, afluorenyl group, a chrysenyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a pyridinyl group, a pyrimidinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinazolinyl group, and a quinoxalinyl group, but they are not limitedthereto.

According to another embodiment, the condensed cyclic compound may berepresented by Formula 1A, and at least one of R₅ and R₇ may be selectedfrom

a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a benzofurocarbazolylgroup, and a benzothiolocarbazolyl group; and

a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a benzofurocarbazolylgroup, and a benzothiolocarbazolyl group, each substituted with at leastone group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group,a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, a phosphoric acid group or asalt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenylgroup, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pycenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group, but they are not limited thereto.

According to another embodiment, the condensed cyclic compound may berepresented by Formula 1A, and in Formula 1A,

L₅ and L₇ may be each independently selected from Formulae 2-1 to 2-33(for example, Formulae 3-1 to 3-38);

a5 and a7 may be each independently 0, 1, or 2;

R₁, R₂, R₃, and R₄ may be each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, ananthracenyl group, a dimethylfluorenyl group, a diphenylfluorenyl group,and a phenylcarbazolyl group;

R₅ and R₇ are each independently selected from Formulae 4-1 to 4-60 (forexample, Formulae 5-1 to 5-91);

R₁₁ and R₁₂ may be each independently selected from a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, ananthracenyl group, a dimethylfluorenyl group, a diphenylfluorenyl group,and a phenylcarbazolyl group; and

b5 and b7 may be each independently 1 or 2, but are not limited thereto.

The condensed cyclic compound may be one of Compounds 1 to 295 below,but is not limited thereto:

The highest occupied molecular orbital (HOMO) and lowest unoccupiedmolecular orbital (LUMO) of the condensed cyclic compound represented byFormula 1 may be controlled, and accordingly, an organic light-emittingdevice including the condensed cyclic compound may achieve highefficiency, long lifespan, and high brightness.

Synthesis methods of the condensed cyclic compound represented byFormula 1 are known to one of ordinary skill in the art by referring toSynthesis Examples provided below.

The condensed cyclic compound represented by Formula 1 is suitable foruse in an organic layer of an organic light-emitting device, forexample, for use as a host in an emission layer of the organic layer.Thus, another aspect provides an organic light-emitting device thatincludes:

a first electrode;

a second electrode; and

an organic layer disposed between the first electrode and the secondelectrode,

wherein the organic layer includes an emission layer and at least one ofthe condensed cyclic compound represented by Formula 1.

The organic light-emitting device may have, due to the inclusion of anorganic layer including the condensed cyclic compound represented byFormula 1, low driving voltage, high efficiency, high brightness, andlong lifespan.

The condensed cyclic compound of Formula 1 may be used between a pair ofelectrodes of an organic light-emitting device. For example, thecondensed cyclic compound may be included in at least one layer selectedfrom

i) the emission layer,

ii) a hole transport region (including, for example, at least one of ahole injection layer, a hole transport layer, a buffer layer, and anelectron blocking layer) that is disposed between the first electrodeand the emission layer, and

iii) an electron transport region (including, for example, at least onelayer selected from a hole blocking layer, an electron transport layer,and an electron injection layer) that is disposed between the emissionlayer and the second electrode.

For example, the condensed cyclic compound represented by Formula 1 maybe included in the emission layer. In this regard, the emission layermay further include a dopant, and the condensed cyclic compound includedin the emission layer may act as a host. The emission layer may be agreen emission layer emitting green light, and the dopant may be aphosphorescent dopant.

The expression “(an organic layer) includes at least one condensedcyclic compound” as used herein may include a case in which “(an organiclayer) includes one condensed cyclic compound of Formula 1 and a case inwhich (an organic layer) includes two or more different condensed cycliccompounds of Formula 1.

For example, the organic layer may include, as the condensed cycliccompound, only Compound 1. In this regard, Compound 1 may exist in anemission layer of the organic light-emitting device. In anotherembodiment, the organic layer may include, as the condensed cycliccompound, Compound 1 and Compound 2. In this regard, Compound 1 andCompound 2 may be situated in either an identical layer (for example,Compound 1 and Compound 2 all may exist in an emission layer), ordifferent layers.

The first electrode may be an anode, which is a hole injectionelectrode, and the second electrode may be a cathode, which is anelectron injection electrode, or the first electrode may be a cathode,which is an electron injection electrode, or the second electrode may bean anode, which is a hole injection electrode.

For example, the first electrode is an anode, and the second electrodeis a cathode, and the organic layer includes

i) a hole transport region that is disposed between the first electrodeand the emission layer and includes at least one of a hole injectionlayer, a hole transport layer, and an electron blocking layer, and

ii) an electron transport region that is disposed between the emissionlayer and the second electrode and includes at least one group selectedfrom a hole blocking layer, an electron transport layer, and an electroninjection layer.

The term “organic layer” as used herein refers to a single layer and/ora plurality of layers disposed between the first electrode and thesecond electrode of an organic light-emitting device. The “organiclayer” may include, in addition to an organic compound, anorganometallic complex including metal.

FIG. 1 is a schematic view of an organic light-emitting device 10according to an embodiment. Hereinafter, the structure of an organiclight-emitting device according to an embodiment and a method ofmanufacturing an organic light-emitting device according to anembodiment will be described in connection with FIG. 1. The organiclight-emitting device 10 includes a first electrode 11, an organic layer15, and a second electrode 19, which are sequentially stacked.

In FIG. 1, a substrate may be additionally disposed under the firstelectrode 11 or above the second electrode 19. For use as the substrate,any substrate that is used in general organic light-emitting devices maybe used, and the substrate may be a glass substrate or transparentplastic substrate, each with excellent mechanical strength, thermalstability, transparency, surface smoothness, ease of handling, and waterrepellency.

The first electrode 11 may be formed by depositing or sputtering amaterial for forming the first electrode on the substrate. The firstelectrode 11 may be an anode. The material for the first electrode 11may be selected from materials with a high work function to facilitatethe injection of holes. The first electrode 13 may be a reflectiveelectrode or a transmissive electrode. The material for the firstelectrode 11 may be an indium tin oxide (ITO), indium zinc oxide (IZO),tin oxide (SnO₂), or zinc oxide (ZnO). According to another embodiment,the material for the first electrode 11 may be metal, such as magnesium(Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca),magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag).

The first electrode 11 may have a single-layer structure or amulti-layer structure including two or more layers. For example, thefirst electrode 11 may have a three-layered structure of ITO/Ag/ITO, butthe structure of the first electrode 110 is not limited thereto.

An organic layer 15 is disposed on the first electrode 11.

The organic layer 15 may include a hole transport region, an emissionlayer, and an electron transport region.

The hole transport region may be disposed between the first electrode 11and the emission layer.

The hole transport region may include at least one of a hole injectionlayer, a hole transport layer, an electron blocking layer, and a bufferlayer.

The hole transport region may include only either a hole injection layeror a hole transport layer. According to another embodiment, the holetransport region may have a structure of hole injection layer/holetransport layer or hole injection layer/hole transport layer/electronblocking layer, which are sequentially stacked in this stated order fromthe first electrode 11.

When the hole injection layer (hole injection layer) includes a holeinjection layer, the hole injection layer may be formed on the firstelectrode 11 by using any one of various methods known to one ofordinary skill in the art, for example, vacuum deposition, spin coating,casting, or Langmuir-Blodgett (LB) deposition.

When a hole injection layer is formed by vacuum deposition, thedeposition conditions may vary according to a material that is used toform the hole injection layer, and the structure and thermalcharacteristics of the hole injection layer. For example, the depositionconditions may include a deposition temperature of about 100 to about500° C., a vacuum pressure of about 10⁻⁸ to about 10⁻³ torr, and adeposition rate of about 0.01 to about 100 Angstroms per second (A/sec).However, the deposition conditions are not limited thereto.

When the hole injection layer is formed using spin coating, coatingconditions may vary according to the material used to form the holeinjection layer, and the structure and thermal properties of the holeinjection layer. For example, a coating speed may be from about 2,000revolutions per minute (rpm) to about 5,000 rpm, and a temperature atwhich a heat treatment is performed to remove a solvent after coatingmay be from about 80° C. to about 200° C. However, the coatingconditions are not limited thereto.

Conditions for a hole transport layer and an electron blocking layer maybe understood by referring to conditions for forming the hole injectionlayer.

The hole transport region may include at least one group selected fromm-MTDATA, TDATA, 2-TNATA, NPB, β-NPB, TPD, Spiro-TPD, Spiro-NPB, α-NPB,TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA),polyaniline/dodecylbenzenesulfonic acid (Pani/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS),polyaniline/camphor sulfonic acid (Pani/CSA),(polyaniline)/poly(4-styrenesulfonate) (PANI/PSS), a compoundrepresented by Formula 201 below, and a compound represented by Formula202 below:

Ar₁₀₁ to Ar₁₀₂ in Formula 201 may be each independently selected from

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anacenaphthylene group, a fluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a naphthacenylene group, a picenylene group, a perylenylenegroup, and a pentacenylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anacenaphthylene group, a fluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a naphthacenylene group, a picenylene group, a perylenylenegroup, and a pentacenylene group, each substituted with at least onegroup selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof,a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₁₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₂-C₁₀ heterocycloalkyl group, a C₂-C₁₀ heterocycloalkenylgroup, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythiogroup, a C₂-C₆₀ heteroaryl group, a monovalent non-aromatic condensedpolycyclic group, and a monovalent non-aromatic condensedheteropolycyclic group.

xa and xb in Formula 201 may be each independently an integer of 0 to 5,or 0, 1 or 2. For example, xa may be 1 and xb may be 0, but xa and xbare not limited thereto.

R₁₀₁ to R₁₀₈, R₁₁₁ to R₁₁₉, and R₁₂₁ to R₁₂₄ in Formulae 201 and 202 maybe each independently selected from

a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, aC₁-C₁₀ alkyl group (for example, a methyl group, an ethyl group, apropyl group, a butyl group, a pentyl group, a hexyl group, and so on)and a C₁-C₁₀ alkoxy group (for example, a methoxy group, an ethoxygroup, a propoxy group, a butoxy group, a pentoxy group, and so on);

a C₁-C₁₀ alkyl group and a C₁-C₁₀ alkoxy group, each substituted with atleast one group selected from a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid or a salt thereof, and a phosphoric acid or a saltthereof;

a phenyl group, a naphthyl group, an anthracenyl group, a fluorenylgroup, and a pyrenyl group; and

a phenyl group, a naphthyl group, an anthracenyl group, a fluorenylgroup, and a pyrenyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, aC₁-C₁₀ alkyl group, and a C₁-C₁₀ alkoxy group, but they are not limitedthereto.

R₁₀₉ in Formula 201 may be selected from a phenyl group, a naphthylgroup, an anthracenyl group and a pyridinyl group; and a phenyl group, anaphthyl group, an anthracenyl group and a pyridinyl group, eachsubstituted with at least one group selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoricacid or a salt thereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group.

According to an embodiment, the compound represented by Formula 201 maybe represented by Formula 201A below, but is not limited thereto:

R₁₀₁, R₁₁₁, R₁₁₂, and R₁₀₉ in Formula 201A may be understood byreferring to the description provided herein.

For example, the compound represented by Formula 201, and the compoundrepresented by Formula 202 may include compounds HT1 to HT20 illustratedbelow, but are not limited thereto.

A thickness of the hole transport region may be in a range of about 100Angstroms (Å) to about 10,000 Å, for example, about 100 Å to about 1,000Å. When the hole transport region includes both a hole injection layerand a hole transport layer, a thickness of the hole injection layer maybe in a range of about 100 Å to about 10,000 Å, for example, about 100 Åto about 1,000 Å, and a thickness of the hole transport layer may be ina range of about 50 Å to about 2,000 Å, for example about 100 Å to about1,500 Å. When the thicknesses of the hole transport region, the holeinjection layer, and the hole transport layer are within these ranges,satisfactory hole transporting characteristics may be obtained without asubstantial increase in driving voltage.

The hole transport region may further include, in addition to thesematerials, a charge-generation material for the improvement ofconductive properties. The charge-generation material may behomogeneously or non-homogeneously dispersed in the hole transportregion.

The charge-generation material may be, for example, a p-dopant. Thep-dopant may be one of a quinone derivative, a metal oxide, and a cyanogroup-containing compound, but is not limited thereto. Non-limitingexamples of the p-dopant are a quinone derivative, such astetracyanoquinonedimethane (TCNQ) or2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ); ametal oxide, such as a tungsten oxide or a molybdenium oxide; and acyano group-containing compound, such as Compound HT-D1 below, but arenot limited thereto.

The hole transport region may include a buffer layer.

Also, the buffer layer may compensate for an optical resonance distanceaccording to a wavelength of light emitted from the emission layer, andthus, efficiency of a formed organic light-emitting device may beimproved.

Then, an emission layer (emission layer) may be formed on the holetransport region by vacuum deposition, spin coating, casting, LBdeposition, or the like. When the emission layer is formed by vacuumdeposition or spin coating, the deposition or coating conditions may besimilar to those applied to form the hole injection layer although thedeposition or coating conditions may vary according to the material thatis used to form the emission layer.

The emission layer may include a host and a dopant. The host may includeat least one condensed cyclic compound represented by Formula 1.

The host may further include, in addition to the condensed cycliccompound represented by Formula 1, at least one of TPBi, TBADN, AND(also referred to as “DNA”), CBP, CDBP, and TCP.

When the organic light-emitting device is a full color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, and a blue emission layer.According to another embodiment, due to a stack structure including ared emission layer, a green emission layer, and/or a blue emissionlayer, the emission layer may emit white light. A host in the redemission layer, the green emission layer, and the blue emission layermay include the condensed cyclic compound represented by Formula 1.According to an embodiment, the host in the green emission layer mayinclude the condensed cyclic compound represented by Formula 1.

A dopant in the emission layer may be a fluorescent dopant that emitslight according to a fluorescent emission mechanism or a phosphorescentdopant that emits light according to a phosphorescent emissionmechanism.

According to an embodiment, the emission layer may include a hostincluding the condensed cyclic compound represented by Formula 1 and aphosphorescent dopant. The phosphorescent dopant may include anorganometallic complex including a transition metal (for example,iridium (Ir), platinum (Pt), osmium (Os), or rhodium (Rh)).

The phosphorescent dopant may include an organometallic complexrepresented by Formula 81 below:

wherein in Formula 81,

M may be selected from iridium (Ir), platinum (Pt), osmium (Os),titanium (Ti), zirconium (Zr), hafnium (Hf), euroform (Eu), terbium(Tb), and tolium (Tm);

Y₁ to Y₄ may be each independently carbon (C) or nitrogen (N); CY₁ andCY₂ may be each independently selected from a benzene, a naphthalene, afluorene, a spiro-fluorene, an indene, a pyrrole, a thiophene, a furan,an imidazole, a pyrazole, a thiazole, an isothiazole, an oxazole, anisooxazole, a pyridine, a pyrazine, a pyrimidine, a pyridazine, aquinoline, a isoquinoline, a benzoquinoline, a quinoxaline, aquinazoline, a carbazole, a benzoimidazole, a benzofuran, abenzothiophene, a isobenzothiophene, a benzooxazole, a isobenzooxazole,a triazole, a tetrazole, a oxadiazole, a triazine, a dibenzofuran, and adibenzothiophene, and CY₁ and CY₂ may be optionally linked to each otherby a single bond or an organic linking group;

R₈₁ and R₈₂ may be each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, —SF₅, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₂-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₂-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arythio group, asubstituted or unsubstituted C₂-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇);

a81 and a82 may be each independently an integer selected from 1 to 5;

n81 may be an integer selected from 0 to 4;

n82 may be 1, 2, or 3;

L₈₁ may be selected from a monovalent organic ligand, a divalent organicligand, and a trivalent organic ligand.

In Formula 81, the bond between Y₁ and Y₂ and the bond between Y₃ and Y₄may be each independently a single bond or a double bond.

R₈₁ to R₈₂ may be understood by referring to the description providedherein in connection with R₁;

The phosphorescent dopant may include at least one of Compounds PD1 toPD74 below, but is not limited thereto:

According to another embodiment, the phosphorescent dopant may includePtOEP or Compound PhGD illustrated below:

The fluorescent dopant may include at least one group selected fromDPAVBi, BDAVBi, TBPe, DCM, DCJTB, Coumarin 6, and C545T.

When the emission layer includes a host and a dopant, an amount of thedopant may be in a range of about 0.01 to about 15 parts by weight basedon 100 parts by weight of the host, but is not limited thereto.

A thickness of the emission layer may be in a range of about 100 Å toabout 1,000 Å, for example, about 200 Å to about 600 Å. When thethickness of the emission layer is within this range, excellentlight-emission characteristics may be obtained without a substantialincrease in driving voltage.

Then, an electron transport region may be disposed on the emissionlayer.

The electron transport region may include at least one group selectedfrom a hole blocking layer, an electron transport layer, and an electroninjection layer.

For example, the electron transport region may have a structure of holeblocking layer/electron transport layer/electron injection layer orelectron transport layer/electron injection layer, but the structure ofthe electron transport region is not limited thereto. The electrontransport layer may have a single-layered structure or a multi-layerstructure including two or more different materials.

Conditions for forming the hole blocking layer, electron transportlayer, and electron injection layer of the electron transport region maybe understood by referring to the conditions for forming the holeinjection layer.

When the electron transport layer includes a hole blocking layer, thehole blocking layer may include, for example, at least one of BCP andBphen, but a material included in the hole blocking layer is not limitedthereto.

A thickness of the hole blocking layer may be in a range of about 20 Åto about 1,000 Å, for example, about 30 Å to about 300 Å. When thethickness of the hole blocking layer is within these ranges, the holeblocking layer may have excellent hole blocking characteristics withouta substantial increase in driving voltage.

The electron transport layer may further include, in addition to thecondensed cyclic compound represented by Formula 1, at least one groupselected from BCP, Bphen, Alq₃, Balq, TAZ, and NTAZ.

According to another embodiment, the electron transport layer mayinclude at least one of ET1 and ET2, but are not limited thereto:

A thickness of the electron transport layer may be in a range of about100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. Whenthe thickness of the electron transport layer is within the rangedescribed above, the electron transport layer may have satisfactoryelectron transport characteristics without a substantial increase indriving voltage.

Also, the electron transport layer may further include, in addition tothe materials described above, a metal-containing material.

The metal-containing material may include a Li complex. The Li complexmay include, for example, Compound ET-D1 (lithium quinolate, LiQ) orET-D2.

The electron transport region may include an electron injection layer(EIL) that allows electrons to be easily provided from a secondelectrode 19.

The electron injection layer may include at least one group selectedfrom, LiF, NaCl, CsF, Li₂O, BaO, and LiQ.

A thickness of the electron injection layer may be in a range of about 1Å to about 100 Å, for example, about 3 Å to about 90 Å. When thethickness of the electron injection layer is within the range describedabove, the electron injection layer may have satisfactory electroninjection characteristics without a substantial increase in drivingvoltage.

The second electrode 19 is disposed on the organic layer 15. The secondelectrode 19 may be a cathode. A material for forming the secondelectrode 19 may be metal, an alloy, an electrically conductivecompound, and a combination thereof, which have a relatively low workfunction. For example, lithium (Li), magnesium (Mg), aluminum (Al),aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), ormagnesium-silver (Mg—Ag) may be formed as the material for forming thesecond electrode 19. To manufacture a top emission type light-emittingdevice, a transmissive electrode formed using ITO or IZO may be used asthe second electrode 19.

Hereinbefore, the organic light-emitting device has been described withreference to FIG. 1, but is not limited thereto.

A C₁-C₆₀ alkyl group used herein refers to a linear or branchedaliphatic hydrocarbon monovalent group having 1 to 60 carbon atoms.Detailed examples thereof are a methyl group, an ethyl group, a propylgroup, an isobutyl group, a sec-butyl group, a tert-butyl group, apentyl group, an iso-amyl group, and a hexyl group. A C₁-C₆₀ alkylenegroup used herein refers to a divalent group having the same structureas the C₁-C₆₀ alkyl group.

A C₁-C₆₀ alkoxy group as used herein refers to a monovalent grouprepresented by -OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group). Detailedexamples thereof are a methoxy group, an ethoxy group, and anisopropyloxy group.

A C₂-C₆₀ alkenyl group as used herein refers to a hydrocarbon groupformed by substituting at least one carbon double bond in the middle orat the terminal of the C₂-C₆₀ alkyl group. Detailed examples thereof arean ethenyl group, a propenyl group, and a butenyl group. A C₂-C₆₀alkenylene group used herein refers to a divalent group having the samestructure as the C₂-C₆₀ alkenyl group.

A C₂-C₆₀ alkynyl group as used herein refers to a hydrocarbon grouphaving at least one carbon triple bond in the middle or at the terminalof the C₂-C₆₀ alkyl group. Detailed examples thereof are an ethynylgroup, and a propynyl group. A C₂-C₆₀ alkynylene group used hereinrefers to a divalent group having the same structure as the C₂-C₆₀alkynyl group.

A C₃-C₁₀ cycloalkyl group as used herein refers to a monovalenthydrocarbon monocyclic group having 3 to 10 carbon atoms. Detailedexamples thereof are a cyclopropyl group, a cyclobutyl group, acyclopentyl group, a cyclohexyl group, and a cycloheptyl group. A C₃-C₁₀cycloalkylene group used herein refers to a divalent group having thesame structure as the C₃-C₁₀ cycloalkyl group.

A C₂-C₁₀ heterocycloalkyl group as used herein refers to a monovalentmonocyclic group having at least one hetero atom selected from N, O, P,and S as a ring-forming atom and 2 to 10 carbon atoms. Detailed examplesthereof are a tetrahydrofuranyl group, and a tetrahydrothiophenyl group.A C₂-C₁₀ heterocycloalkylene group used herein refers to a divalentgroup having the same structure as the C₂-C₁₀ heterocycloalkyl group.

A C₃-C₁₀ cycloalkenyl group as used herein refers to a monovalentmonocyclic group that has 3 to 10 carbon atoms and at least one doublebond in the ring thereof and does not have aromaticity. Detailedexamples thereof are a cyclopentenyl group, a cyclohexenyl group, and acycloheptenyl group. A C₃-C₁₀ cycloalkenylene group used herein refersto a divalent group having the same structure as the C₃-C₁₀ cycloalkenylgroup.

A C₂-C₁₀ heterocycloalkenyl group as used herein refers to a monovalentmonocyclic group that has at least one heteroatom selected from N, O, P,and S as a ring-forming atom, 2 to 10 carbon atoms, and at least onedouble bond in its ring. Detailed examples of the C₂-C₁₀heterocycloalkenyl group are a 2,3-dihydrofuranyl group and a2,3-dihydrothiophenyl group. A C₂-C₁₀ heterocycloalkenylene group usedherein refers to a divalent group having the same structure as theC₂-C₁₀ heterocycloalkenyl group.

A C₆-C₆₀ aryl group as used herein refers to a monovalent group having acarbocyclic aromatic system having 6 to 60 carbon atoms, and a C₆-C₆₀arylene group used herein refers to a divalent group having acarbocyclic aromatic system having 6 to 60 carbon atoms. Detailedexamples of the C₆-C₆₀ aryl group are a phenyl group, a naphthyl group,an anthracenyl group, a phenanthrenyl group, a pyrenyl group, and achrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylene groupeach include two or more rings, the rings may be fused to each other.

A C₂-C₆₀ heteroaryl group as used herein refers to a monovalent grouphaving a carbocyclic aromatic system that has at least one hetero atomselected from N, O, P, and S as a ring-forming atom, and 2 to 60 carbonatoms. A C₂-C₆₀ heteroarylene group used herein refers to a divalentgroup having a carbocyclic aromatic system that has at least one heteroatom selected from N, O, P, and S as a ring-forming atom, and 2 to 60carbon atoms. Detailed example of the C₂-C₆₀ heteroaryl group are apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, and an isoquinolinylgroup. When the C₂-C₆₀ heteroaryl group and the C₂-C₆₀ heteroarylenegroup each include two or more rings, the rings may be fused to eachother.

The C₆-C₆₀ aryloxy group as used herein indicates —OA₁₀₂ (wherein A₁₀₂is the C₆-C₆₀ aryl group), and the C₆-C₆₀ arylthio indicates —SA₁₀₃(wherein A₁₀₃ is the C₆-C₆₀ aryl group).

A monovalent non-aromatic condensed polycyclic group as used hereinrefers to a monovalent group that has two or more rings condensed toeach other, only carbon atoms (for example, the number of carbon atomsmay be in a range of 8 to 60) as ring forming atoms, wherein themolecular structure as a whole is non-aromatic. A detailed example ofthe monovalent non-aromatic condensed polycyclic group is a fluorenylgroup. A divalent non-aromatic condensed polycyclic group used hereinrefers to a divalent group having the same structure as the monovalentnon-aromatic condensed polycyclic group.

A monovalent non-aromatic condensed heteropolycyclic group used hereinrefers to a monovalent group that has two or more rings condensed toeach other, has a heteroatom selected from N, O P, and S, other thancarbon atoms (for example, the number of carbon atoms may be in a rangeof 2 to 60), as ring forming atoms, wherein the molecular structure as awhole is non-aromatic. A detailed example of the monovalent non-aromaticcondensed heteropolycyclic group is a carbazolyl group. A divalentnon-aromatic condensed heteropolycyclic group used herein refers to adivalent group having the same structure as the monovalent non-aromaticcondensed heteropolycyclic group.

At least one substituent of the substituted C₁-C₆₀ alkylene group, thesubstituted C₂-C₆₀ alkenylene group, the substituted C₂-C₆₀ alkynylenegroup, the substituted C₃-C₁₀ cycloalkylene group, the substitutedC₂-C₁₀ heterocycloalkylene group, the substituted C₃-C₁₀ cycloalkenylenegroup, the substituted C₂-C₁₀ heterocycloalkenylene group, thesubstituted C₆-C₆₀ arylene group, the substituted C₂-C₆₀ heteroarylenegroup, the substituted divalent non-aromatic condensed polycyclic group,the substituted divalent non-aromatic condensed heteropolycyclic group,the substituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenylgroup, the substituted C₂-C₆₀ alkynyl group, the substituted C₃-C₁₀cycloalkyl group, the substituted C₂-C₁₀ heterocycloalkyl group, thesubstituted C₃-C₁₀ cycloalkenyl group, the substituted C₂-C₁₀heterocycloalkenyl group, the substituted C₆-C₆₀ aryl group, thesubstituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀ arythio group,the substituted C₂-C₆₀ heteroaryl group, the substituted monovalentnon-aromatic condensed polycyclic group, and the substituent monovalentnon-aromatic condensed heteropolycyclic group may be selected from

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, aC₃-C₁₀ cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and —B(Q₁₆)(Q₁₇);

a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one group selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),—Si(Q₂₃)(Q₂₄)(Q₂₅), and —B(Q₂₆)(Q₂₇); and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇).

Also, Q₁ to Q₇, Q₁₁ to Q₁₇, Q₃₁ to Q₃₇, and Q₃₁ to Q₃₇ may be eachindependently selected from a hydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic hetero-condensed polycyclic group.

For example, at least one substituent of the substituted C₁-C₆₀ alkylenegroup, the substituted C₂-C₆₀ alkenylene group, the substituted C₂-C₆₀alkynylene group, the substituted C₃-C₁₀ cycloalkylene group, thesubstituted C₂-C₁₀ heterocycloalkylene group, the substituted C₃-C₁₀cycloalkenylene group, the substituted C₂-C₁₀ heterocycloalkenylenegroup, the substituted C₆-C₆₀ arylene group, the substituted C₂-C₆₀heteroarylene group, the substituted divalent non-aromatic condensedpolycyclic group, the substituted divalent non-aromatic condensedheteropolycyclic group, the substituted C₁-C₆₀ alkyl group, thesubstituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group,the substituted C₃-C₁₀ cycloalkyl group, the substituted C₂-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₂-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀arythio group, the substituted C₂-C₆₀ heteroaryl group, the substitutedmonovalent non-aromatic condensed polycyclic group, and the substituentmonovalent non-aromatic condensed heteropolycyclic group may be selectedfrom

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, aC₃-C₁₀ cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and —B(Q₁₆)(Q₁₇);a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, aphenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthrenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a pycenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pyrrolyl group, animidazolyl group, a pyrazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthylidinyl group, a quinoxalinyl group, a quinazolinyl group, acynolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzooxazolyl group, a benzoimidazolyl group, a furanyl group, abenzofuranyl group, a thiophenyl group, a benzothiophenyl group, athiazolyl group, an isothiazolyl group, a benzothiazolyl group, anisooxazolyl group, an oxazolyl group, a triazolyl group, a tetrazolylgroup, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group,a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, an imidazopyrimidinyl group, and an imidazopyridinyl group, eachsubstituted with at least one group selected from a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclooctyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, aphenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, aphenanthrenyl group, a fluorenyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a pyridinyl group, apyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a phthalazinyl group,a quinoxalinyl group, a cynolinyl group, and a quinazolinyl group;a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, aphenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthrenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a pycenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pyrrolyl group, animidazolyl group, a pyrazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthylidinyl group, a quinoxalinyl group, a quinazolinyl group, acynolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzooxazolyl group, a benzoimidazolyl group, a furanyl group, abenzofuranyl group, a thiophenyl group, a benzothiophenyl group, athiazolyl group, an isothiazolyl group, a benzothiazolyl group, anisooxazolyl group, an oxazolyl group, a triazolyl group, a tetrazolylgroup, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group,a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, an imidazopyrimidinyl group, and an imidazopyridinyl group, eachsubstituted with at least one group selected from a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclooctyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, aphenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, aphenanthrenyl group, a fluorenyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a pyridinyl group, apyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a phthalazinyl group,a quinoxalinyl group, a cynolinyl group, and a quinazolinyl group, eachsubstituted with at least one group selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoricacid or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group,a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₂-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arythio group, a C₂-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), and—B(Q₂₆)(Q₂₇); and—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇), whereinQ₁ to Q₇, Q₁₁ to Q₁₇, and Q₃₁ to Q₃₇ may be each independently selectedfrom a phenyl group, a pentalenyl group, an indenyl group, a naphthylgroup, an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, aphenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthrenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a pycenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pyrrolyl group, animidazolyl group, a pyrazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthylidinyl group, a quinoxalinyl group, a quinazolinyl group, acynolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzooxazolyl group, a benzoimidazolyl group, a furanyl group, abenzofuranyl group, a thiophenyl group, a benzothiophenyl group, athiazolyl group, an isothiazolyl group, a benzothiazolyl group, anisooxazolyl group, an oxazolyl group, a triazolyl group, a tetrazolylgroup, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group,a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, an imidazopyrimidinyl group and an imidazopyridinyl group, eachsubstituted with at least one group selected from a hydrogen, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclooctyl group, a cyclopentenyl group, a cyclohexenyl group,a cycloheptenyl group, a phenyl group, a naphthyl group, an anthracenylgroup, a pyrenyl group, a phenanthrenyl group, a fluorenyl group, acarbazolyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aphthalazinyl group, a quinoxalinyl group, a cynolinyl group and aquinazolinyl group, but they are not limited thereto.

Hereinafter, a compound and an organic light-emitting device accordingto embodiments is described in detail with reference to SynthesisExample and Examples. However, the organic light-emitting device is notlimited thereto. The wording “B was used instead of A” used indescribing Synthesis Examples means that a molar equivalent of A wasidentical to a molar equivalent of B.

EXAMPLE Synthesis Example 1 Synthesis of Compound 1 Synthesis ofIntermediate A

In a 1 L round-bottom flask, 50 g (312.09 mmol) of3,3-dimethyl-1-indanone and 31.46 g (296.48 mmol) of benzaldehyde weresuspended in 500 ml of ethanol, and then, 18.73 g (468.13 mmol) ofsodium hydroxide was slowly added thereto. After 12 hours of stirring,the reaction solution was concentrated and then, subjected to silicagelcolumn (hexane:methylene chloride=4:1) to obtain 62 g (yield=83%) ofIntermediate A as a target compound.

Synthesis of Intermediate B

In a 1 L round-bottom flask, 62 g (249.68 mmol) of Intermediate A, 58.8g (249.68 mmol) of 4-bromobenzamidine hydrochloride, and 40.45 g (749.03mmol) of sodium methoxide were suspended in 500 ml of 2-ethoxyethanol,and then, the resultant mixture was refluxed for 48 hours whilestirring. When the reaction stopped, the reaction solution wasconcentrated, and then, the concentrate was subjected to silicagelcolumn to obtain 40 g (yield=37.4%) of Intermediate B.

¹H-NMR (300 MHz, CDCl₃) δ 8.50 (d, 2H, J=8.70 Hz), 7.55 (m, 10H), 7.45(m, 1H), 1.37 (s, 6H).

Synthesis of Compound 1

In a 500 ml flask, 9.86 g (23.07 mmol) of Intermediate B, 4.24 g (25.38mmol) of carbazole, 2.11 g (2.31 mmol) of Pd₂(dba)₃, 6.65 g (69.22 mmol)of sodium-tert-butoxide, and 0.47 g (2.31 mmol) oftri-tert-butylphosphine (50% in toluene) were suspended in 100 ml oftoluene, and then, the resultant mixture was refluxed for 12 hours whilestirring. When the reaction stopped, the reaction solution wasconcentrated and then, the concentrate was subjected to silicagel columnto obtain 16 g (yield=50%) of Compound 1.

¹H-NMR (300 MHz, CDCl₃) δ 8.82 (d, 2H), 8.29 (d, 1H), 8.18 (d, 2H), 7.71(d, 2H), 7.55 (m, 10H), 7.43 (t, 2H), 7.30 (t, 2H), 1.40 (s, 6H).

Synthesis Example 2 Synthesis of Compound 2

In a 500 L round-bottomed flask, 10 g (23.40 mmol) of Intermediate B,5.87 g (25.74 mmol) of 4-dibenzothienylboronic acid, 0.81 g (0.70 mmol)of tetrakis(triphenylphosphine)palladium(0), and 6.47 g (46.80 mmol) ofpotassium carbonate were mixed with 120 ml of toluene and 60 ml ofdistilled water, and then, the mixture was refluxed for 12 hours whilestirring. When the reaction stopped, the reaction solution was cooled toroom temperature, and then, extracted and concentrated and then, theresult was subjected to silicagel column to obtain 8.69 g (yield=70%) ofCompound 2.

¹H-NMR (300 MHz, CDCl₃) δ 8.11 (d, 2H), 8.01 (d, 1H), 7.73 (d, 2H), 7.62(d, 2H), 7.53 (m, 11H), 7.31 (t, 2H), 1.45 (s, 6H).

Synthesis Example 3 Synthesis of Compound 25 Synthesis of Intermediate C

In a 1 L round-bottom flask, 50 g (201.35 mmol) of Intermediate A, 47.42g (201.35 mmol) of 3-bromobenzamidine hydrochloride, and 32.62 g (604.06mmol) of sodium methoxide were suspended in 500 ml of 2-ethoxyethanol,and then, the resultant mixture was refluxed for 48 hours whilestirring. When the reaction stopped, the reaction solution wasconcentrated, and then, the concentrate was subjected to silicagelcolumn to obtain 40 g (yield=46%) of Intermediate C.

Synthesis of Compound 25

In a 500 ml flask, 10 g (23.40 mmol) of Intermediate C, 4.30 g (25.74mmol) of carbazole, 2.14 g (2.34 mmol) of Pd₂(dba)₃, 6.75 g (70.20 mmol)of sodium-tert-butoxide, and 0.47 g (2.34 mmol) oftri-tert-butylphosphine (50% in toluene) were suspended in 100 ml oftoluene, and then, the resultant mixture was refluxed for 12 hours whilestirring. When the reaction stopped, the reaction solution wasconcentrated and then, the concentrate was subjected to silicagel columnto obtain 7.12 g (yield=59%) of Compound 25.

¹H-NMR (300 MHz, CDCl₃) δ 8.60 (d, 2H), 8.13 (d, 1H), 8.05 (d, 2H), 7.71(d, 2H), 7.51 (m, 12H), 7.43 (t, 2H), 1.42 (s, 6H).

Synthesis Example 4 Synthesis of Compound 129 Synthesis of IntermediateD

In a 1 L round-bottom flask, 50 g (312.09 mmol) of3,3-dimethyl-1-indanone and 54.85 g (296.48 mmol) of 4-bromobenzaldehydewere suspended in 500 ml of ethanol, and then, 18.73 g (468.13 mmol) ofsodium hydroxide was slowly added thereto. After 12 hours of stirring,the reaction solution was concentrated and then, subjected to silicagelcolumn (hexane:methylene chloride=4:1) to obtain 70 g (yield=69%) ofIntermediate D.

Synthesis of Intermediate E

In a 1 L round-bottom flask, 70 g (213.92 mmol) of Intermediate D, 33.50g (213.92 mmol) of benzamidine hydrochloride, and 34.66 g (641.77 mmol)of sodium methoxide were suspended in 100 ml of toluene, and then, themixture was refluxed for 12 hours while stirring. When the reactionstopped, the reaction solution was concentrated and then, theconcentrate was subjected to silicagel column to obtain 42 g (yield=46%)of Intermediate E.

Synthesis of Compound 129

6.8 g (yield: 57%) of Compound 129 was obtained in the same manner asused to synthesize Compound 1 in Synthesis Example 1, except that 10 g(23.40 mmol) of Intermediate E was used instead of Intermediate B.

¹H-NMR (300 MHz, CDCl₃) δ 8.52 (d, 2H), 8.29 (d, 1H), 8.00 (m, 4H), 7.55(m, 12H), 7.30 (t, 2H), 1.38 (s, 6H).

Synthesis Example 5 Synthesis of Compound 161

4.6 g (yield: 37%) of Compound 161 was obtained in the same manner asused to synthesize Compound 2 in Synthesis Example 2, except that 10 g(23.40 mmol) of Intermediate E was used instead of Intermediate B.

¹H-NMR (300 MHz, CDCl₃) δ 8.09 (d, 2H), 7.90 (d, 1H), 7.61 (d, 2H), 7.47(d, 2H), 7.53 (m, 11H), 7.31 (t, 2H), 1.41 (s, 6H).

Evaluation Example 1 HOMO, LUMO, and Triplets (T1) Energy LevelEvaluation

HOMO, LUMO and T1 energy levels of Compounds 1 and 129 were evaluatedaccording to the method indicated in Table 1, and results thereof areshown in Table 2.

TABLE 1 HOMO energy Each compound was diluted in CHCl₃ to aconcentration of 1 × 10⁻⁵M, level evaluation and then, UV absorptionspectrum thereof was measured at room method temperature by usingShimadzu UV-350 Spectrometer. A HOMO energy level of the compound wascalculated by using an optical band gap (Eg) measured by the edge of theabsorption spectrum. LUMO energy Cyclic voltammetry (CV) (electrolyte:0.1M Bu₄NClO₄/solvent: level evaluation CH₂Cl₂/electrode: 3 electrodesystem (working electrode: GC, method reference electrode: Ag/AgCl,auxiliary electrode: Pt)) were used to obtain a potential (V)-current(A) graph of each compound, and then, from reduction onset of the graph,the LUMO energy level of each compound was calculated. T1 energy level Amixture (each compound was dissolved in an amount of 1 mg in 3evaluation method cc of toluene) of toluene and each compound was loadedinto a quartz cell, and then, the resultant quartz cell was loaded intoliquid nitrogen (77K) and a photoluminescence spectrum thereof wasmeasured by using a device for measuring photoluminescence, and theobtained spectrum was compared with a photoluminescence spectrummeasured at room temperature, and peaks appearing only at lowtemperature were analyzed to calculate T1 energy levels.

TABLE 2 Compound No. HOMO (eV) LUMO (eV) T1 energy level (eV) Compound 15.87 2.42 2.72 Compound 129 5.90 2.55 2.84

Evaluation Example 2 Thermal Characteristics Evaluation

Thermal analysis (N₂ atmosphere, a temperature range of room temperatureto 800° C. (10° C./min)—TGA, from room temperature to 400° C.—DSC, PanType: Pt Pan in disposable Al Pan(TGA), and disposable Al pan(DSC)) wasperformed on Compounds 1 and 129 by using thermo gravimetric analysis(TGA) and differential scanning calorimetry (DSC), and results thereofare shown in Table 3, FIG. 2 (TGA data of Compound 1), FIG. 3 (DSC dataof Compound 1), FIG. 4 (TGA data of Compound 129), and FIG. 5 (DSC dataof Compound 129). According to Table 3 and FIGS. 1 to 4, Compounds 1 and129 have excellent thermal stability.

TABLE 3 Compound No. Tc (° C.) Tm (° C.) Tg (° C.) Compound 1 — — 111.40Compound 129 — 276.65 112.18

Example 1

A glass substrate with a 1,500 Å-thick indium tin oxide (ITO) electrode(first electrode, anode) disposed thereon was washed with distilledwater and ultrasonic waves. After the distilled water washing,ultrasonic-waves washing is performed thereon by using a solvent, suchas isopropyl alcohol, acetone, or methanol, and then, dried, and then,transferred to a plasma cleaner, and the substrate was cleaned withoxygen plasma for 5 minutes, and then, the substrate was transferred toa vacuum depositor.

Compound HT5 was vacuum deposited on the ITO electrode of the glasssubstrate to form a hole transport layer having a thickness of 1,200 Å,thereby forming a hole transport region.

Compound 1 (host) and PhGD (dopant, 7 wt %) were co-deposited on thehole transport region to form an emission layer having a thickness of300 Å.

Balq was vacuum deposited on the emission layer to form a first electrontransport layer having a thickness of 50 Å, and Alq₃ was vacuumdeposited on the first electron transport layer to form a secondelectron transport layer having at thickness of 250 Å, and then, LiF wasdeposited on the second electron transport layer to form an electroninjection layer having a thickness of 5 Å, and then, an Al secondelectrode (cathode) having a thickness of 1,000 Å was formed on theelectron injection layer, thereby completing manufacturing an organiclight-emitting device.

Example 2

An organic light-emitting device was manufactured in the same manner asin Example 1, except that as a host, Compound 2 was used instead ofCompound 1.

Example 3

An organic light-emitting device was manufactured in the same manner asin Example 1, except that as a host, Compound 25 was used instead ofCompound 1.

Example 4

An organic light-emitting device was manufactured in the same manner asin Example 1, except that as a host, Compound 129 was used instead ofCompound 1.

Example 5

An organic light-emitting device was manufactured in the same manner asin Example 1, except that as a host, Compound 161 was used instead ofCompound 1.

Comparative Example 1

An organic light-emitting device was manufactured in the same manner asin Example 1, except that as a host, CBP was used instead of Compound 1.

Evaluation Example 3 Evaluation on Characteristics of an OrganicLight-Emitting Device

The current density change, brightness change, and emission efficiencyof each of the organic light-emitting devices manufactured according toExamples 1 to 5 and Comparative Example 1 were measured. Details of themeasurement method are as follows, and results thereof are shown inTable 4:

(1) Change in Current Density According to Voltage

Regarding the manufactured organic light-emitting devices, while thevoltage increased from 0 V to 10 V, the current flowing a unit devicewas measured by using a current-voltage meter (Keithley 2400), and thecurrent measurement values were divided by an area to evaluate a changein current density according to voltage.

(2) Change in Brightness According to Voltage

Regarding the manufactured organic light-emitting devices, while thevoltage increased from 0 V to 10 V, brightness was measured by using abrightness meter (Minolta Cs-1000A) to evaluate a change in brightnessaccording to voltage.

(3) Emission Efficiency Measurement

Current efficiency (cd/A) was calculated at the same current density (10mA/cm²) by using the brightness, the current density, and voltage whichwere measured in (1) and (2).

TABLE 4 Driving Color Voltage Efficiency coordinate Host Dopant (V)(cd/A) CIE x CIE y Example 1 Compound PhGD 6.8 50.4 0.33 0.62 1 Example2 Compound PhGD 7.1 54.2 0.34 0.62 2 Example 3 Compound PhGD 6.4 49.20.34 0.62 25 Example 4 Compound PhGD 6.5 43.6 0.33 0.62 129 Example 5Compound PhGD 6.7 47.8 0.33 0.62 161 Comparative CBP PhGD 8.5 45.4 0.330.62 Example 1

From Table 4, it was confirmed that the organic light-emitting devicesof Examples 1 to 5 had a lower driving voltage and a higher efficiencythan the organic light-emitting devices of Comparative Example 1.

The condensed cyclic compound according to embodiments has excellentelectric characteristics and thermal stability. Accordingly, an organiclight-emitting device including the condensed cyclic compound may have alow driving voltage, high efficiency, high brightness, and a longlifespan.

It should be understood that the exemplary embodiments described thereinshould be considered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments.

While one or more embodiments have been described with reference to thefigures, it will be understood by those of ordinary skill in the artthat various changes in form and details may be made therein withoutdeparting from the spirit and scope of the present disclosure as definedby the following claims.

What is claimed is:
 1. A condensed cyclic compound represented byFormula 1:

wherein in Formula 1, X₁ is N or C-[(L₁)_(a1)-(R₁)_(b1)], X₂ is N orC-[(L₂)_(a2)-(R₂)_(b2)], X₃ is N or C-[(L₃)_(a3)-(R₃)_(b3)], X₄ is N orC-[(L₄)_(a4)-(R₄)_(b4)], X₅ is N or C-[(L₅)_(a5)-(R₅)_(b5)], X₆ is N orC-[(L₆)_(a6)-(R₆)_(b6)], X₇ is N or C-[(L₇)_(a7)-(R₇)_(b7)], X₈ is N orC-[(L₈)_(a8)-(R₈)_(b8)], provided that at least one of X₁ to X₈ is N; L₁to L₈, L₁₁, and L₁₂ are each independently selected from a substitutedor unsubstituted C₃-C₁₀ cycloalkylene group, a substituted orunsubstituted C₂-C₁₀ heterocycloalkylene group, a substituted orunsubstituted C₃-C₁₀ cycloalkenylene group, a substituted orunsubstituted C₂-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₂-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic hetero-condensed polycyclic group;a1 to a8, a11, and a12 are each independently an integer from 0 to 3; R₁to R₈, R₁₁, and R₁₂ are each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a substitutedor unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstitutedC₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynylgroup, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substitutedor unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₂-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₂-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arythio group, a substituted orunsubstituted C₂-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇); b1 to b8, b11, and b12 areeach independently an integer from 1 to 5; wherein at least one ofsubstituents of the substituted C₃-C₁₀ cycloalkylene group, thesubstituted C₂-C₁₀ heterocycloalkylene group, the substituted C₃-C₁₀cycloalkenylene group, the substituted C₂-C₁₀ heterocycloalkenylenegroup, the substituted C₆-C₆₀ arylene group, the substituted C₂-C₆₀heteroarylene group, the substituted divalent non-aromatic condensedpolycyclic group, the substituted divalent non-aromatic condensedheteropolycyclic group, the substituted C₁-C₆₀ alkyl group, thesubstituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group,the substituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkylgroup, the substituted C₂-C₁₀ heterocycloalkyl group, the substitutedC₃-C₁₀ cycloalkenyl group, the substituted C₂-C₁₀ heterocycloalkenylgroup, the substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxygroup, the substituted C₆-C₆₀ arythio group, the substituted C₂-C₆₀heteroaryl group, the substituted monovalent non-aromatic condensedpolycyclic group, and the substituted monovalent non-aromatic condensedheteropolycyclic group is selected from a deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group,each substituted with at least one group selected from a deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkylgroup, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arythio group, a C₂-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇); a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, aC₂-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, and a monovalent non-aromatic condensed heteropolycyclic group; aC₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one group selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arythio group, a C₂-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),—Si(Q₂₃)(Q₂₄)(Q₂₅), and —B(Q₂₆)(Q₂₇); and —N(Q₃₁)(Q₃₂),—Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇), wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁to Q₂₇, and Q₃₁ to Q₃₇ are each independently selected from a hydrogen,a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₂-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arythio group, a C₂-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group.
 2. The condensed cyclic compound ofclaim 1, wherein at least one of X₅ to X₈ is N.
 3. The condensed cycliccompound of claim 1, wherein X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)], X₂ maybe C-[(L₂)_(a2)-(R₂)_(b2)], X₃ may be C-[(L₃)_(a3)-(R₃)_(b3)], X₄ may beC-[(L₄)_(a4)-(R₄)_(b4)], X₅ may be C-[(L₅)_(a5)-(R₅)_(b5)], X₆ may be N,X₇ may be C-[(L₇)_(a)-(R₇)_(b7)], and X₈ may be N.
 4. The condensedcyclic compound of claim 1, wherein L₁ to L₈, L₁₁, and L₁₂ are eachindependently selected from a phenylene group, a pentalenylene group, anindenylene group, a naphthylene group, an azulenylene group, aheptalenylene group, an indacenylene group, an acenaphthylene group, afluorenylene group, a spiro-fluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthrenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a naphthacenylene group, a picenylene group, a perylenylenegroup, a pentaphenylene group, a hexacenylene group, a pyrrolylenegroup, an imidazolylene group, a pyrazolylene group, a pyridinylenegroup, a pyrazinylene group, a pyrimidinylene group, a pyridazinylenegroup, an isoindolylene group, an indolylene group, an indazolylenegroup, a purinylene group, a quinolinylene group, an isoquinolinylenegroup, a benzoquinolinylene group, a phthalazinylene group, anaphthyridinylene group, a quinoxalinylene group, a quinazolinylenegroup, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzooxazolylene group, abenzoimidazolylene group, a furanylene group, a benzofuranylene group, athiophenylene group, a benzothiophenylene group, a thiazolylene group,an isothiazolylene group, a benzothiazolylene group, an isoxazolylenegroup, an oxazolylene group, a triazolylene group, a tetrazolylenegroup, a oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolyl group, adibenzocarbazolyl group, an imidazopyrimidinylene group, and animidazopyridinylene group; and a phenylene group, a pentalenylene group,an indenylene group, a naphthylene group, an azulenylene group, aheptalenylene group, an indacenylene group, an acenaphthylene group, afluorenylene group, a spiro-fluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthrenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a naphthacenylene group, a picenylene group, a perylenylenegroup, a pentaphenylene group, a hexacenylene group, a pyrrolylenegroup, an imidazolylene group, a pyrazolylene group, a pyridinylenegroup, a pyrazinylene group, a pyrimidinylene group, a pyridazinylenegroup, an isoindolylene group, an indolylene group, an indazolylenegroup, a purinylene group, a quinolinylene group, an isoquinolinylenegroup, a benzoquinolinylene group, a phthalazinylene group, anaphthyridinylene group, a quinoxalinylene group, a quinazolinylenegroup, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzooxazolylene group, abenzoimidazolylene group, a furanylene group, a benzofuranylene group, athiophenylene group, a benzothiophenylene group, a thiazolylene group,an isothiazolylene group, a benzothiazolylene group, an isoxazolylenegroup, an oxazolylene group, a triazolylene group, a tetrazolylenegroup, a oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolyl group, adibenzocarbazolyl group, an imidazopyrimidinylene group, and animidazopyridinylene group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a C₆-C₂₀ aryl group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heterocyclic group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), and Q₃₃ to Q₃₅ are each independently selected froma hydrogen, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group,a naphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenylgroup, a fluorenyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a pyridinyl group, a pyrimidinyl group, apyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinylgroup, an isoquinolinyl group, a phthalazinyl group, a quinoxalinylgroup, a cynolinyl group, and a quinazolinyl group.
 5. The condensedcyclic compound of claim 1, wherein L₁ to L₈, L₁₁, and L₁₂ are eachindependently selected from Formulae 2-1 to 2-33:

wherein in Formulae 2-1 to 2-33, Y₁ is 0, S, S(═O), S(═O)₂, C(Z₃)(Z₄),N(Z₅), or Si(Z₆)(Z₇); Z₁ to Z₇ are each independently selected from ahydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, anaphthyl group, an anthracenyl group, a triphenylenyl group, a pyrenylgroup, a phenanthrenyl group, a fluorenyl group, a chrysenyl group, acarbazolyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a pyridinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinazolinyl group, a quinoxalinyl group, abiphenyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅); Q₃₃ to Q₃₅ are eachindependently selected from a hydrogen, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a naphthyl group, an anthracenyl group, apyrenyl group, a phenanthrenyl group, a fluorenyl group, a chrysenylgroup, a carbazolyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, a pyridinylgroup, a pyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinazolinyl group, and a quinoxalinyl group; andd1 is an integer of 1 to 4, d2 is an integer of 1 to 3, d3 is an integerof 1 to 6, d4 is an integer of 1 to 8; d5 is an integer of 1 or 2, d6 isan integer of 1 to 5, and * and *′ each indicates a binding site to aneighboring atom.
 6. The condensed cyclic compound of claim 1, whereinL₁ to L₈, L₁₁, and L₁₂ are each independently selected from Formulae 3-1to 3-38:

wherein in Formulae 3-1 to 3-38, * and *′ each indicates a binding siteto a neighboring atom.
 7. The condensed cyclic compound of claim 1,wherein a1 to a8, a11, and a12 are each independently 0, 1, or
 2. 8. Thecondensed cyclic compound of claim 1, wherein R₁ to R₈, R₁₁, and R₁₂ areeach independently selected from a hydrogen, a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxygroup; a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substitutedwith at least one group selected from a deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid group or a salt thereof, and a phosphoric acidgroup or a salt thereof; a phenyl group, a pentalenyl group, an indenylgroup, a naphthyl group, an azulenyl group, a heptalenyl group, anindacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a picenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisooxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; a phenyl group, a pentalenyl group, anindenyl group, a naphthyl group, an azulenyl group, a heptalenyl group,an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a picenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisooxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a pentalenyl group, an indenylgroup, a naphthyl group, an azulenyl group, a heptalenyl group, anindacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a pycenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazole group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthylidinylgroup, a quinoxalinyl group, a quinazolinyl group, a cynolinyl group, acarbazolyl group, a phenanthridinyl, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, and a biphenyl group; and —Si(Q₃)(Q₄)(Q₅);wherein Q₃ to Q₅ and Q₃₃ to Q₃₅ are each independently selected from ahydrogen, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, anaphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenylgroup, a fluorenyl group, a chrysenyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a pyridinyl group, a pyrimidinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinazolinyl group, and a quinoxalinyl group.
 9. The condensed cycliccompound of claim 1, wherein R₁ to R₈, R₁₁, and R₁₂ are eachindependently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxygroup; a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substitutedwith at least one group selected from a deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid group or a salt thereof, and a phosphoric acidgroup or a salt thereof; a phenyl group, a naphthyl group, a fluorenylgroup, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a pycenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinylgroup, a quinazolinyl group, a carbazolyl group, a phenanthridinylgroup, a phenanthrolinyl group, a benzoimidazolyl group, a benzofuranylgroup, a benzothiophenyl group, an isobenzothiazolyl group, abenzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, an imidazopyridinyl group, an imidazopyrimidinyl group, abenzofurocarbazolyl group, and a benzothiolocarbazolyl group; and aphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group, a fluorenyl group,a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pycenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a phenanthridinyl group, aphenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzooxazolylgroup, an isobenzooxazolyl group, a triazolyl group, an oxadiazolylgroup, a triazinyl group, a dibenzofuranyl group, a dibenzothio group, aphenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyridinyl group, and an imidazopyrimidinyl group; and Q₃₃ to Q₃₅are each independently selected from a hydrogen, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, an anthracenylgroup, a pyrenyl group, a phenanthrenyl group, a fluorenyl group, achrysenyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a pyridinyl group, a pyrimidinyl group, a triazinyl group, aquinolinyl group, an isoquinolinyl group, a quinazolinyl group, and aquinoxalinyl group.
 10. The condensed cyclic compound of claim 1,wherein R₁ and R₅ are each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and a C₁-C₂₀alkoxy group, each substituted with at least one group selected from adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, and a phosphoric acid group or a salt thereof; andFormulae 4-1 to 4-60; R₁₁ and R₁₂ are each independently selected from aC₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and aC₁-C₂₀ alkoxy group, each substituted with at least one group selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acidgroup or a salt thereof, and a phosphoric acid group or a salt thereof;and Formulae 4-1 to 4-60:

wherein in Formulae 4-1 to 4-60, Y₃₁ is O, S, C(Z₃₃)(Z₃₄), N(Z₃₅), orSi(Z₃₆)(Z₃₇); Z₃₁ to Z₃₉ are each independently selected from ahydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group, a fluorenyl group,a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pycenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a phenanthridinyl group, aphenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzooxazolylgroup, an isobenzooxazolyl group, a triazolyl group, an oxadiazolylgroup, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyridinyl group, and an imidazopyrimidinyl group; Q₃₃ to Q₃₅ areeach independently selected from a hydrogen, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, an anthracenylgroup, a pyrenyl group, a phenanthrenyl group, a fluorenyl group, achrysenyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a pyridinyl group, a pyrimidinyl group, a triazinyl group, aquinolinyl group, an isoquinolinyl group, a quinazolinyl group, and aquinoxalinyl group; and e1 is an integer of 1 to 5; e2 is an integer of1 to 7; e3 is an integer of 1 to 3; e4 is an integer of 1 to 4; e5 is aninteger of 1 or 2; e6 is an integer of 1 to 6, and * indicates a bindingsite to a neighboring atom.
 11. The condensed cyclic compound of claim1, wherein R₁ and R₈ are each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and a C₁-C₂₀alkoxy group, each substituted with at least one group selected from adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, and a phosphoric acid group or a salt thereof; andFormulae 5-1 to 5-91; R₁₁ and R₁₂ are each independently selected from aC₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and aC₁-C₂₀ alkoxy group, each substituted with at least one group selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acidgroup or a salt thereof, and a phosphoric acid group or a salt thereof;and Formulae 5-1 to 5-91:

wherein in Formulae 5-1 to 5-91, * indicates a binding site to aneighboring atom.
 12. The condensed cyclic compound of claim 1, whereinthe condensed cyclic compound is represented by Formula 1A:

wherein in Formula 1A, L₅, L₇, a5, a7, R₁, R₂, R₃, R₄, R₅, R₇, R₁₁, R₁₂,b5, and b7 in Formula 1A are the same as in claim
 1. 13. The condensedcyclic compound of claim 12, wherein L₅ to L₇ are each independentlyselected from a phenylene group, a naphthylene group, a fluorenylenegroup, a spiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pirenylene group, a chrisenylene group, apicenylene group, a pyridinylene group, a pyrazinylene group, apyrimidinylene group, a pyridazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a quinoxalinylenegroup, a quinazolinylene group, a carbazolylene group, aphenanthridinylene group, a phenanthrolinylene group, abenzoimidazolylene group, a benzofuranylene group, a benzothiophenylenegroup, an isobenzothiazolylene group, a benzooxazolylene group, anisobenzooxazolylene group, a triazolylene group, an oxadiazolylenegroup, a triazinylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, an imidazopyridinylene group, and animidazopyrimidinylene group; a phenylene group, a naphthylene group, afluorenylene group, a spiro-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pirenylene group, a chrisenylenegroup, a picenylene group, a pyridinylene group, a pyrazinylene group, apyrimidinylene group, a pyridazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a quinoxalinylenegroup, a quinazolinylene group, a carbazolylene group, aphenanthridinylene group, a phenanthrolinylene group, abenzoimidazolylene group, a benzofuranylene group, a benzothiophenylenegroup, an isobenzothiazolylene group, a benzooxazolylene group, anisobenzooxazolylene group, a triazolylene group, an oxadiazolylenegroup, a triazinylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, an imidazopyridinylene group, and animidazopyrimidinylene group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pycenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group; a5 and a7 are each independently 0, 1, or 2;R₁, R₂, R₃, and R₄ are each independently selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and a C₁-C₂₀alkoxy group, each substituted with at least one group selected from adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid group or asalt thereof, and a phosphoric acid group or a salt thereof; a phenylgroup, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pycenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; and a phenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a pycenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinylgroup, a quinazolinyl group, a carbazolyl group, a phenanthridinylgroup, a phenanthrolinyl group, a benzoimidazolyl group, a benzofuranylgroup, a benzothiophenyl group, an isobenzothiazolyl group, abenzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, an imidazopyridinyl group, an imidazopyrimidinyl group, abenzofurocarbazolyl group, and a benzothiolocarbazolyl group, eachsubstituted with at least one group selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group,a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a pycenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinylgroup, a quinazolinyl group, a carbazolyl group, a phenanthridinylgroup, a phenanthrolinyl group, a benzoimidazolyl group, a benzofuranylgroup, a benzothiophenyl group, an isobenzothiazolyl group, abenzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothio group, a phenyl group, a benzocarbazolyl group, adibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group; R₅ and R₇ are each independently selected froma phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; and a phenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a pycenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinylgroup, a quinazolinyl group, a carbazolyl group, a phenanthridinylgroup, a phenanthrolinyl group, a benzoimidazolyl group, a benzofuranylgroup, a benzothiophenyl group, an isobenzothiazolyl group, abenzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, an imidazopyridinyl group, an imidazopyrimidinyl group, abenzofurocarbazolyl group, and a benzothiolocarbazolyl group, eachsubstituted with at least one group selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group,a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a pycenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinylgroup, a quinazolinyl group, a carbazolyl group, a phenanthridinylgroup, a phenanthrolinyl group, a benzoimidazolyl group, a benzofuranylgroup, a benzothiophenyl group, an isobenzothiazolyl group, abenzooxazolyl group, an isobenzooxazolyl group, a triazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothio group, a phenyl group, a benzocarbazolyl group, adibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group; R₁₁ and R₁₂ are each independently selectedfrom a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkylgroup and a C₁-C₂₀ alkoxy group, each substituted with at least onegroup selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid group or a salt thereof, and a phosphoric acid group ora salt thereof; a phenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a pycenyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a phenanthridinyl group, aphenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzooxazolylgroup, an isobenzooxazolyl group, a triazolyl group, an oxadiazolylgroup, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyridinyl group, an imidazopyrimidinyl group, abenzofurocarbazolyl group, and a benzothiolocarbazolyl group; and aphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apycenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), a phenyl group, a naphthyl group, a fluorenyl group,a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pycenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a phenanthridinyl group, aphenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzooxazolylgroup, an isobenzooxazolyl group, a triazolyl group, an oxadiazolylgroup, a triazinyl group, a dibenzofuranyl group, a dibenzothio group, aphenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, animidazopyridinyl group, and an imidazopyrimidinyl group; b5 and b7 areeach independently 1 or 2, wherein Q₃₃ to Q₃₅ are each independentlyselected from a hydrogen, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, aphenanthrenyl group, a fluorenyl group, a chrysenyl group, a carbazolylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a pyridinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinazolinyl group, and a quinoxalinyl group. 14.The condensed cyclic compound of claim 12, wherein at least one of R₅and R₇ in Formula 1A is selected from a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group; and a carbazolyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a benzofurocarbazolyl group, and abenzothiolocarbazolyl group, each substituted with at least one groupselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pycenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a phenanthridinyl group, a phenanthrolinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzooxazolyl group, an isobenzooxazolylgroup, a triazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group.
 15. The condensed cyclic compound of claim 12,wherein L₅ and L₇ are each independently selected from Formulae 3-1 to3-38; a5 and a7 are each independently 0, 1, or 2; R₁, R₂, R₃, and R₄are each independently selected from a hydrogen, a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a naphthyl group, an anthracenyl group, adimethylfluorenyl group, a diphenylfluorenyl group, and aphenylcarbazolyl group; R₅ and R₇ are each independently selected fromFormulae 5-1 to 5-91; R₁₁ and R₁₂ are each independently selected from aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthylgroup, an anthracenyl group, a dimethylfluorenyl group, adiphenylfluorenyl group, and a phenylcarbazolyl group; and b5 and b7 areeach independently 1 or
 2.

wherein in Formulae 3-1 to 3-38 and 5-1 to 5-91, * and indicates abinding site to a neighboring atom.
 16. The condensed cyclic compound ofclaim 1, wherein the condensed cyclic compound is one of Compounds 1 to295:


17. An organic light-emitting device comprising: a first electrode; asecond electrode; and an organic layer disposed between the firstelectrode and the second electrode, wherein the organic layer comprisesan emission layer and at least one of the condensed cyclic compoundrepresented by Formula 1 of claim
 1. 18. The organic light-emittingdevice of claim 17, wherein the first electrode is an anode, the secondelectrode is a cathode, and the organic layer comprises i) a holetransport region disposed between the first electrode and the emissionlayer and comprising at least one of a hole injection layer, a holetransport layer, and an electron blocking layer, and ii) an electrontransport region disposed between the emission layer and the secondelectrode and comprising at least one layer selected from a holeblocking layer, an electron transport layer, and an electron injectionlayer.
 19. The organic light-emitting device of claim 17, wherein theemission layer comprises the condensed cyclic compound of claim
 1. 20.The organic light-emitting device of claim 19, wherein the emissionlayer further comprises a dopant, and the condensed cyclic compound is ahost.